Q41.1 This illustration shows the possible orientations of the angular momentum vector in a hydrogen atom state with l = 2. This illustration tells us.

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Presentation on theme: "Q41.1 This illustration shows the possible orientations of the angular momentum vector in a hydrogen atom state with l = 2. This illustration tells us."— Presentation transcript:

1 Q41.1This illustration shows the possible orientations of the angular momentum vector in a hydrogen atom state with l = 2.This illustration tells us that for a given value of Lz,1. the angular momentum vector can point in any direction tangent to the cone for that value of Lz2. the electron orbits along one of the red circles, so the orbit may or may not have the nucleus at its center3. both 1. and 2. are true4. neither 1. nor 2. is true

2 A41.1This illustration shows the possible orientations of the angular momentum vector in a hydrogen atom state with l = 2.This illustration tells us that for a given value of Lz,1. the angular momentum vector can point in any direction tangent to the cone for that value of Lz2. the electron orbits along one of the red circles, so the orbit may or may not have the nucleus at its center3. both 1. and 2. are true4. neither 1. nor 2. is true

3 Q41.2This illustration shows radial probability distribution functions for three hydrogen-atom wave functions, plotted versus r/a (r = distance from the center of the atom, a = nm).Which statement is correct?1. a hydrogen electron in a 4p state is always farther from the center of the atom than is a hydrogen electron in a 2p state2. a hydrogen electron in a 2p state is never found at the precise center of the atom3. a 3p state has 3 units of orbital angular momentum4. none of the above is true

4 A41.2This illustration shows radial probability distribution functions for three hydrogen-atom wave functions, plotted versus r/a (r = distance from the center of the atom, a = nm).Which statement is correct?1. a hydrogen electron in a 4p state is always farther from the center of the atom than is a hydrogen electron in a 2p state2. a hydrogen electron in a 2p state is never found at the precise center of the atom3. a 3p state has 3 units of orbital angular momentum4. none of the above is true

5 Q41.3If a sample of gas atoms is placed in a strong, uniform magnetic field, the spectrum of the atoms changes. Why is this?1. electrons have magnetic moments due to their spin and their orbital motion2. the nucleus is positively charged and the electrons are negatively charged, so they are pushed in opposite directions by a magnetic field3. electrons are drawn into regions of strong magnetic field4. electrons are repelled from regions of strong magnetic field5. none of the above

6 A41.3If a sample of gas atoms is placed in a strong, uniform magnetic field, the spectrum of the atoms changes. Why is this?1. electrons have magnetic moments due to their spin and their orbital motion2. the nucleus is positively charged and the electrons are negatively charged, so they are pushed in opposite directions by a magnetic field3. electrons are drawn into regions of strong magnetic field4. electrons are repelled from regions of strong magnetic field5. none of the above

7 Q41.4Potassium has 19 electrons. It is relatively easy to remove one electron, but substantially more difficult to then remove a second electron. Why is this?1. the second electron feels a stronger attraction to the other electrons than did the first electron that was removed2. when the first electron is removed, the other electrons readjust their orbits so that they are closer to the nucleus3. the first electron to be removed was screened from more of the charge on the nucleus than is the second electron4. all of the above5. none of the above

8 A41.4Potassium has 19 electrons. It is relatively easy to remove one electron, but substantially more difficult to then remove a second electron. Why is this?1. the second electron feels a stronger attraction to the other electrons than did the first electron that was removed2. when the first electron is removed, the other electrons readjust their orbits so that they are closer to the nucleus3. the first electron to be removed was screened from more of the charge on the nucleus than is the second electron4. all of the above5. none of the above

9 Q41.5Ordinary hydrogen has one electron and one proton. It requires 10.2 eV of energy to move an electron from the innermost (K) shell in hydrogen into the next (L) shell.The most common form of uranium has 92 electrons, 92 protons, and 146 neutrons. The energy required to move an electron from the K shell to the L shell of this form of uranium is1. (91)(10.2 eV)2. (92)(10.2 eV)3. (91)2(10.2 eV)4. (92)2(10.2 eV)5. none of the above

10 A41.5Ordinary hydrogen has one electron and one proton. It requires 10.2 eV of energy to take an electron from the innermost (K) shell in hydrogen and move it into the next (L) shell.The most common form of uranium has 92 electrons, 92 protons, and 146 neutrons. The energy required to move an electron from the K shell to the L shell of this form of uranium is1. (91)(10.2 eV)2. (92)(10.2 eV)3. (91)2(10.2 eV)4. (92)2(10.2 eV)5. none of the above